Union Springs, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 24.3 °C (high). Annual precipitation averages 1402.3 Millimeters. Union Springs is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °C | 14.4 °C | 123.19 mm |
| February | 3.3 °C | 16.7 °C | 120.65 mm |
| March | 6.7 °C | 20.8 °C | 139.19 mm |
| April | 10.3 °C | 24.4 °C | 112.01 mm |
| May | 15.4 °C | 28.3 °C | 93.98 mm |
| June | 19.5 °C | 31.3 °C | 132.59 mm |
| July | 21.2 °C | 32.6 °C | 139.7 mm |
| August | 21 °C | 32.2 °C | 119.89 mm |
| September | 18.1 °C | 30.1 °C | 99.31 mm |
| October | 11.9 °C | 25.2 °C | 75.69 mm |
| November | 6.1 °C | 19.8 °C | 113.03 mm |
| December | 3.3 °C | 15.6 °C | 133.1 mm |
| Annual | 11.5 °C | 24.3 °C | 1402.33 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |